<template>
    <div class="todo-footer" v-show="total">
			<label>
				<!-- <input type="checkbox" :checked="isAll" @change="checkAll"/> -->
                <input type="checkbox" v-model="isAll"/>
			</label>
			<span>
				<span>已完成{{ doneTotal}}</span> / 全部{{total}}
			</span>
			<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
	</div>
</template>

<script>
    export default {
        name:'my-footer',
        props:['todos'],
        computed:{
            total(){
                return this.todos.length
            },
            doneTotal(){
                return this.todos.reduce((pre,current)=> pre + (current.done?1:0),0)
            },
            isAll:{
                get(){
                    return this.doneTotal===this.total && this.total>0
                },
                set(value){
                    this.$emit('checkAllTodo',value)
                }
            }
        },
        methods:{
            clearAll(){
                this.$emit('clearAllTodo')
            }
        }
    }
</script>

<style scoped>
    /*footer*/
	.todo-footer {
		height: 40px;
		line-height: 40px;
		padding-left: 6px;
		margin-top: 5px;
	}
	
	.todo-footer label {
		display: inline-block;
		margin-right: 20px;
		cursor: pointer;
	}
	
	.todo-footer label input {
		position: relative;
		top: -1px;
		vertical-align: middle;
		margin-right: 5px;
	}
	
	.todo-footer button {
		float: right;
		margin-top: 5px;
	}
</style>